Improvement in clock striking-movements



H. D. NORTHROP. Clock-StrikingMovement.

No. 200.564. Patented F'eb.19,1878.

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I ff 0 UNITED STATES PATENT OEEIoE.

HIItAM D. NORTHROP, OF WATERBURY, CONNECTICUT, ASSIGNOR TO THE WATERBURYCLOCK COMPANY, OF SAME PLACE.

IMPROVEMENT IN CLOCK STRlKlNG-MOVEMENTS.

Specification forming part of Letters Patent No. 200,564, dated February19, 1878; application filed January 3, 1878.

To all whom it may concern:

Be it known that I, HIRAM D. N ORTHROP, of Waterbury, in the county ofNew Haven and State of Connecticut, have invented a new and usefulImprovement in Clock-Movements; and I do hereby declare the following,when taken in connection with the accompanyin g drawings and the lettersof reference marked thereon, to be a full, clear, and exact descriptionof the same, and which said drawings constitute part of thisspecification, and represent, in

Figure 1, sectional front view; Fig. 2, the minute-pointer shaftdetached.

This invention relates to an improvement in that class ofclock-movements in which are combined both time and striking parts, the

object being a simple device whereby the halfhour may be struck withoutthe assistance of the machinery of the striking part; and it consists inproviding the hammer with a second arm, and combining therewith a cam onthe minute-pointer shaft, so that at -the half-hour, or otherpredetermined time, the said cam will have raised the hammer so as toallow it to escape at such predetermined time, as more fully hereinafterdescribed.

A is the rear part of the frame of an ordinary clock-movement, the frontpart removed for convenience of illustration. B is the usual strikewheel or cam, which aotuates the hammer C, the hammer being hung on apivot, a, with an arm, D, extending up to the strikewheel B, so thatwhen the strike-wheel B revolves the hammer will be actuated in theusual manner; E, the winter-shaft which is arranged to revolve once ineach hour, and

carries the minute-pointer b, in the usual manner. On this shaft E acam, (I, is placed, and from the hammer-shaft a second arm, F, extendsup to the right of the shaft E, so that the cam (1 will strike the saidarm as the shaft revolves, and force the arm F away from the shaft andturn the hammer accordingly, as indicated in broken lines, until the camhas so far turned that the arm F will escape from it. This escapement iscertain, and occurs at the time when the pointer reaches the half-hour,so that at that instant the hammer will strike one blow without the aidof the striking mechanism of the clock.

In Fig. 2 0 represents the lever as at the point of escaping.

In order to prevent the cam striking the lever F when the pointers areturned backward, the side of the cam is beveled or cut back, as seen inFig. 2, so that when the lever F lies against or near the shaft, asindicated at n of Fig. 2, a reverse or backward movement of the pointerswill bring the inclined side f of the cam against the arm F, and thatarm, being elastic, will be forced back or away from the side of thecam, so that the cam may pass without interference.

I claim- In combination with the time and striking parts of aclock-movement, the second arm F from the hammer, and cam d on theminutepointer shaft, substantially as and for the purpose described.

HIRAM D. NORTHROP.

WVitnesses:

T. R. TAYLOR, H. L. WADE.

